Windows Whistler was Microsoft's development codename for the operating system released in 2001 as Windows XP, and its beta builds circulated widely among testers and collectors. Interest in those early builds later grew into a large online archive culture around lost startup and shutdown sounds. This version is explicitly marked fake, meaning it is a modern recreation made to sound plausible for a Whistler beta rather than an extracted system file. Collectors and editors still share it for documenting concepts, comparing real beta audio, and building convincing period-correct OS simulations.